Rigid polyurethane foams with constant or slightly decreasing strain with an increasing stress in compression

ABSTRACT

Rigid polyurethane foams which exhibit constant or slightly decreasing strain with an increasing stress in compression are prepared employing from 30 to 60 parts of an oxyalkylated toluenediamine polyol per 100 parts of polyol mixture. These foams may be employed in shoring up geological formations.

This application is a continuation-in-part of Ser. No. 652,838, filed Sept. 21, 1984, now U.S. Pat. No. 4,614,754.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to rigid polyurethane foams having physical properties which result in constant or slightly decreasing strain with an increasing stress in compression. Further, this invention relates to a method of shoring up a geological formation which comprises employing these rigid foams and interposing these foams over a support between those geological formation areas which are to be shored up.

2. Description of the Prior Art

U.S. Pat. No. 4,114,382 teaches a method of consolidating geological formations by applying a polyurethane reaction system to the material to be consolidated. This reaction system comprises a polyisocyanate component and a polyol component wherein the polyol component contains about 50:50 weight percent of a polyether having an OH number under about 100 and about 95:5 percent by weight of a polyol selected from the group consisting of those having 2 to 4 hydroxyl groups with a molecular weight of about 62 to 200 and a polyether polyol having an OH number about 200 to 1056 with a molecular weight of about 106 to 1000.

U.S. Pat. No. 4,452,551 teaches a process for stabilizing rock and coal formation by use of a polyurethane forming mixture which employs as the polyol component a mixture comprising polyether polyol having a hydroxyl number of 390 to 580 and having a functionality of 3 to 8 hydroxyl groups with a difunctional polyol having a hydroxyl number of 200 to 300 and from 0 to 100 parts by weight of a flexibilizing agent having a hydroxyl number of 50 to 200.

U.S. Pat. No. 4,454,252 teaches a method of sealing and consolidating water bearing geological formations by reacting a polyisocyanate in equal volume with a polyol, the polyol having a molecular weight between 400 and 600 and a hydroxyl number between 340 and 400 in the presence of an accelerator and a foam stabilizer. None of the prior art teaches the employment of a rigid polyurethane foam system which exhibits nearly constant strain with increasing stress in compression by employing an effective amount of a polyol which is an ethylene oxide-propylene oxide adduct of a toluenediamine isomer mixture.

The subject invention relates to a rigid polyurethane foam which exhibits nearly constant strain with increasing stress in compression. This rigid foam is the reaction product of a mixture of polyether polyols and organic polyisocyanates, a catalyst and a silicone surfactant wherein said polyol mixture comprises an effective amount of an oxyalkylated toluenediamine polyol having a structure of ##STR1## wherein w, x, y, and z represent numerals from 0 to 2; a, b, c, and d represent numerals from 1 to 5; w+x+y+z is from 2 to 5; a+b+c+d is from 2 to 5 and wherein w+x+y+z+a+b+c+d is not less than 5 nor more than 9 and a polyether polyol having a functionality from 2 to 8 and a molecular weight range from 200 to 1000. This rigid polyurethane foam may be advantageously employed for shoring up a geological formation and in equalizing the strain with increasing stress and compression of any such condition by placing a layer of said rigid foam between the imposing force and the resisting force.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 illustrates four curves, A, B, C, and D.

Curve A represents a foam exhibiting constant strain with increasing stress in compression.

Curve B represents a foam exhibiting constant strain with increasing stress in compression.

Curve C represents a foam exhibiting slightly decreasing strain with increasing stress in compression.

Curve D represents a foam exhibiting increasing strain with increasing stress in compression.

FIG. 2 represents a mine shaft wherein 2 is the wall, 4 is the ceiling, and 6 is the floor of the shaft. A beam 8 is positioned across ceiling 4 with beam 8 being supported by posts 10 and 12 interposed between beam 8 and floor 6. Wedges 13 are inserted between posts 10 and 12 and floor 6. Caps 14 and 16 are fitted over posts 10 and 12, respectively.

FIG. 3 illustrates further cap 14 with the outer shell 20 consisting of metal and core 22 consisting of rigid polyurethane foam which exhibits nearly constant strain with increasing stress in compression.

FIG. 4 is a cross-sectional view of beam 8, cap 14 and post 10 wherein h₁ represents the original height of the rigid foam in cap 14 and h₂ is the height of the foam due to compression as a result of the settling of ceiling 4.

FIGS. 5 and 6 are different embodiments of post 10 and cap 14.

DESCRIPTION OF THE PREFERRED EMBODIMENT

A rigid polyurethane foam which exhibits nearly constant strain with increasing stress in compression is prepared by reacting a mixture of polyether polyols, an organic polyisocyanate, in the presence of a urethane catalyst and a silicone surfactant incorporating in the polyol mixture an effective amount of a polyol having a structure of ##STR2## wherein w, x, y, and z represent numerals from 0 to 2; a, b, c, and d represent numerals from 1 to 5; w+x+y+z is from 2 to 5; a+b+c+d is from 2 to 5 and wherein w+x+y+z+a+b+c+d is not less than 5 nor more than 9 and a polyether polyol having a functionality from 2 to 8 and a molecular weight range from 200 to 1000. Preferably wherein w+x+y+z is about 4 and a+b+c+d is about 5. This polyol is prepared by reacting a toluenediamine isomer mixture with the desired amount of ethylene oxide and followed by capping with propylene oxide in accordance with the limitations imposed hereinabove. The toluenediamine is composed of 2,4-, 2,6-, 2,3-, and 3,4-isomers of toluenediamine, predominantly the vicinal isomers. These polyols are prepared by well known procedures employed for oxyalkylation. As stated above, the amount of toluenediamine adduct employed is one which effectively produces a rigid foam having nearly constant strain with increasing stress in compression. Preferably this range is from 30 to 60 parts of oxyalkylated toluenediamine polyol per 100 parts of polyol mixture.

The polyurethane foams of the invention have the advantage of constant or slightly decreasing strain with increasing stress in compression. This means that the rigid foams may be employed in situations wherein increasing stress is imparted to a support. For example, the ceiling in mines is shored with wooden supports. When the compressive load increases upon the rigid support, it collapses suddenly. The load carried by this support is now transferred to the surrounding supports which may then collapse under the additional load. Thus, the ceiling may collapse catastrophically. It is contemplated that a method of shoring a geological formation comprises preparing a rigid polyurethane foam which exhibits nearly constant strain with increasing stress in compression wherein the rigid foam is the reaction product of a mixture of polyether polyols, an organic polyisocyanate, a catalyst and a silicone surfactant wherein said polyol mixture comprises an effective amount of an oxyalkylated toluenediamine polyol having a structure of ##STR3## wherein w, x, y, and z represent numerals from 0 to 2; a, b, c, and d reprsent numerals from 1 to 5; w+x+y+z is from 2 to 5; a+b+c+d is from 2 to 5 and wherein w+x+y+z+a+b+c+d is not less than 5 nor more than 9, and a polyether polyol having a functionality from 2 to 8 and a molecular weight range from 200 to 1000 and placing said rigid foam over a support and interposing said support between the areas to be shored. Preferably the polyol mixture contains from about 30 to about 60 parts of oxyalkylated toluenediamine polyol per 100 parts of polyol mixture. When the ceiling settles, part of the strain is alleviated by compression of the foam. As the ceiling is actually moving, the load is spread throughout the ceiling rather than concentrated upon an incompressible post. Until such time that the foam is compressed to the limit of its compressibility, the individual post is not subjected to the full load. It is contemplated that the rigid foam of the invention may be employed in other situations wherein it is desirable to equalize strain between an imposing force and a resisting force. Thus, it has been discovered that a method of equalizing strain with increasing stress in compression may be accomplished by forming a layer of a polyurethane rigid foam which exhibits nearly constant strain with increasing stress in compression wherein the rigid foam is the reaction product of a mixture of polyether polyols, an organic polyisocyanate, a catalyst and a silicone surfactant wherein said polyol mixture comprises an effective amount of a polyol having a structure of ##STR4## wherein w, x, y, and z represent numerals from 0 to 2; a, b, c, and d represent numerals from 1 to 5; w+x+y+z is from 2 to 5; a+b+c+d is from 2 to 5 and wherein w+x+y+z+a+b+c+d is not less than 5 nor more than 9 and a polyether polyol having a functionality from 2 to 8 and a molecular weight range from 200 to 1000 and placing said layer between the imposing force and the resisting force.

Suitable polyether polyols which may be employed in mixture with the toluenediamine initiated polyol have a functionality from 2 to 8 and a molecular weight range from 200 to 1000. These polyether polyols are produced in accordance with well known methods by reacting one or more alkylene oxides with 2 to 4 carbon atoms in the alkylene radical with initiator molecules containing from 2 to 8 reactive hydrogen atoms. Suitable alkylene oxides include ethylene oxide, propylene oxide, and butylene oxide. Preferably used initiator molecules are ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, 1,2-butane diol, 1,3-butane diol, 1,4-butane diol, 1,2-pentane diol, 1,4-pentane diol, 1,5-pentane diol, 1,6-hexane diol, 1,7-heptane diol, glycerol, 1,1,1-trimethylol propane, 1,1,1,-trimethyol ethane, 1,2,6-hexane triol, a-methyl glucoside, pentaerythritol, sorbitol, and sucrose. Also included are compounds derived from phenols such as 2,2-bis-4-hydroxy phenyl propane, commonly known as Bisphenol A. Other initiator molecules include amines such as trialkanolamine, triethanolamine, triisopropanolamine, aliphatic, cycloaliphatic and aromatic diamines with 2 to 15 carbon atoms such as ethylenedimaine, 1,3-propanediamine, carbon atoms such as ethylenedimaine, 1,3-propanediamine, propylene diamine, 1,4-butanediamine, 1,6-hexamethylenediamine, 1,4-diaminocyclohexane, 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane.

Organic polyisocyanates which may be employed include aromatic, aliphatic, and cycloaliphatic polyisocyanates and combinations thereof. Representative of these types are the diisocyanates such as m-phenylene diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, mixtures of 2,4- and 2,6-toluene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, cyclohexane-1,4-diisocyanate, hexahydrotoluene diisocyanate (and isomers), naphthalene-1,5-diisocyanate, 1-methoxyphenyl-2,4-diisocyanate, 4,4'-diphenylmethane diisocyanate, 4,4'-biphenylene diisocyanate, 3,3'-dimethoxy-4,4'-biphenyl diisocyanate, 3,3'-dimethyl-4,4'-biphenyl diisocyanate and 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate; the triisocyanates such as 4,4',4"-triphenylmethane triisocyanate, and toluene 2,4,6-triisocyanate; and the tetraisocyanates such as 4,4'-dimethyldiphenylmethane-2,2'-5,5'-tetraisocyanate and polymeric polyisocyanates such as polymethylene polyphenylene polyisocyanate. Especially useful due to their availability and properties are toluene diisocyanate, 4,4'-diphenylmethane diisocyanate and polymethylene polyphenylene polyisocyanate.

Crude polyisocyanates may also be used in the compositions of the present invention, such as crude toluene diisocyanate obtained by the phosgenation of a mixture of toluenediamines or crude diphenylmethane isocyanate obtained by the phosgenation of crude diphenylmethane diamine. The preferred or crude isocyanates are disclosed in U.S. Pat. No. 3,215,652.

Chain-extending agents which may be employed in the preparation of the polyurethane foams include those compounds having at least two functional groups bearing active hydrogen atoms such as water, hydrazine, primary and secondary diamines, amino alcohols, amino acids, hydroxy acids, glycols, or mixtures thereof. A preferred group of chain-extending agents includes water, ethylene glycol, 1,4-butanediol and primary and secondary diamines such as phenylene diamine, 1,4-cyclohexane-bis-(methylamine), ethylenediamine, diethylenetriamine, N-(2-hydroxypropyl)ethylenediamine, N,N'-di(2-hydroxypropyl)ethylenediamine, piperazine, and 2-methylpiperazine.

Any suitable catalyst may be used including tertiary amines such as, for example, triethylenediamine, N-methylmorpholine, N-ethylmorpholine, diethylethanolamine, N-cocomorpholine, 1-methyl-4-dimethylaminoethylpiperazine, 3-methoxypropyldimethylamine, N,N,N'-trimethylisopropyl propylenediamine, 3-diethylaminopropyldiethylamine, dimethylbenzylamine, and the like. Other suitable catalysts are, for example, stannous chloride, dibutyltin di-2-ethyl hexanoate, stannous oxide, as well as other organometallic compounds such as are disclosed in U.S. Pat. No. 2,846,408.

A surface-active agent is generally necessary for production of high grade polyurethane foam according to the present invention, since in the absence of same, the foams collapse or contain very large uneven cells. Numerous surface-active agents have been found satisfactory. Nonionic surface active agents are preferred. Of these, the nonionic surface-active agents such as the well-known silicones have been found particularly desirable. Other surface-active agents which are operative, although not preferred, include polyethylene glycol ethers of long chain alcohols, tertiary amine or alkanolamine salts of long chain alkyl acid sulfate esters, alkyl sulfonic esters, and alkyl arylsulfonic acids.

If desired, flame retardants may be incorporated in the foams. Among the flame retardants which may be employed are: pentabromodiphenyl oxide, dibromopropanol, tris(b-chloropropyl)phosphate, 2,2-bis(bromoethyl) 1,3-propanediol, tetrakis(2-chloroethyl)ethylene diphosphate, tris(2,3-dibromopropyl)phosphate, tris(b-chloroethyl)phosphate, tris(1,2-dichloropropyl)phosphate, bis-(2-chloroethyl) 2-chloroethylphosphonate, molybdenum trioxide, ammonium molybdate, ammonium phosphate, pentabromodiphenyl oxide, tricresylphosphate, hexabromocyclododecane and dibromoethyl dibromocyclohexane. The concentrations of flame retardant compounds which may be employed range from 1 to 25 parts per 100 parts of polyol mixture.

The parts referred to in the Examples are parts by weight. The following abbreviations are employed.

Polyol A is a propylene oxide adduct of glycerine having a molecular weight of about 420 and a hydroxyl number of about 400.

Polyol B is a propylene oxide adduct of propylene glycol having a molecular weight of about 430 and a hydroxyl number of about 260.

Polyol C is a propylene oxide, ethylene oxide adduct of a mixture of toluenediamine isomers containing predominantly vicinal isomers, having a molecular weight of about 600, a hydroxyl number of about 400 and containing 30 percent ethylene oxide, capped with propylene oxide.

Polyol D is a propylene oxide adduct of a pentaerythritol and propylene glycol mixture having a molecular weight of about 360 and a hydroxyl number of 560.

Polyol E is a propylene oxide adduct of a mixture of toluenediamine isomers containing predominantly vicinal isomers, having a molecular weight of 570 and a hydroxyl number of 390.

Polyol F is a propylene oxide adduct of a sucrose propylene glycol mixture, having a molecular weight of 640 and a hydroxyl number of 570.

Polyol G is a propylene oxide adduct of a sucrose, dipropylene glycol mixture, having a molecular weight of 620 and a hydroxyl number of 400.

Polyol H is a propylene oxide adduct of ethylenediamine, having a molecular weight of 290 and a hydroxyl number of 770.

Isocyanate A is an oligomeric polymethylene polyphenylene polyisocyanate having an average functionality of about 2.7.

DC-193 is a silicone surfactant sold by Dow Corning.

Dabco 33LV is a catalyst sold by Air Products Corp.

T12 is a catalyst sold by M&T Corp.

Curves A-D of FIG. 1 were developed employing the Standard Test Method for Compressive Properties of Rigid Cellular Plastics, ASTM D-1621-73 (reapproved 1979). Curves A, B, and C illustrate foams having a property of constant or slowly decreasing strain with an increasing stress.

Curve D illustrates increasing strain with increasing stress.

EXAMPLE 1-28

The polyurethane foams of Tables I, II, III, and IV were prepared by charging a container with a suitable quantity of the reactants with the exception of the isocyanate as tabulated. The mixture was stirred for about 30 seconds, and allowed to set until the air bubbles had dissipated. The calculated amount of polyisocyanate was added to the container, and the resulting mixture was stirred for about 35 seconds, and the foam was allowed to rise therein. After the foam rise was completed, the resulting foam was cured for about seven days at room temperature. The physical properties were then determined.

                                      TABLE I                                      __________________________________________________________________________                     Example                                                                        1   2     3  4  5  6  7  8  9                                  __________________________________________________________________________     Formulation, pbw                                                               Polyol A        59.4                                                                               59.4  59.4                                                                              59.4                                                                              59.4                                                                              59.4                                                                              84.8                                                                              84.8                                                                              70                                 Polyol B        10.6                                                                               10.6  10.6                                                                              10.6                                                                              10.6                                                                              10.6                                                                              15.2                                                                              15.2                                                                              --                                 Polyol D        30  --    -- -- -- -- -- -- --                                 Polyol C        --  30    -- -- -- -- -- -- --                                 Polyol E        --  --    30 -- -- -- -- -- --                                 Polyol F        --  --    -- 30 -- -- -- -- --                                 Polyol G        --  --    -- -- -- 30 -- -- 30                                 Polyol H        --  --    -- -- 30 -- -- -- --                                 DO-193          0.2 0.2   0.2                                                                               0.2                                                                               0.2                                                                               0.2                                                                               0.1                                                                               0.2                                                                               0.2                                DABCO 33LV      0.63                                                                               0.63  0.63                                                                              0.63                                                                              0.21                                                                              0.63                                                                              0.63                                                                              0.63                                                                              0.63                               T-12            0.07                                                                               0.07  0.07                                                                              0.07                                                                              0.07                                                                              0.07                                                                              0.07                                                                              0.07                                                                              0.07                               Water           0.32                                                                               0.32  0.32                                                                              0.32                                                                              0.32                                                                              0.32                                                                              0.32                                                                              0.32                                                                              0.32                               Isocyanate A    138 118   119                                                                               135                                                                               154                                                                               119                                                                               117                                                                               118                                                                               123                                Foam Properties                                                                Foam Density, pcf                                                                              41.9                                                                               32.0  31.0                                                                              39.9                                                                              50.2                                                                              32.3                                                                              35.4                                                                              36.2                                                                              34.0                               Foam Compression Strength, psi                                                                 5600                                                                               2800  3260                                                                              4380                                                                              6840                                                                              2600                                                                              2600                                                                              2700                                                                              2820                               @ 10% Deflection                                                               Slope           Rising                                                                             No change                                                                            Rising                                               __________________________________________________________________________

Table I illustrates that rigid foam incorporating the oxyalkylated toluenediamine polyol of the invention exhibits a constant slope when strain is measured at increasing stress. The rising slope indicates increasing strain with increasing stress.

                  TABLE II                                                         ______________________________________                                                         Example                                                                        10   11     12     13   14                                     ______________________________________                                         Formulation, pbw                                                               Polyol A          50.9   59.4   59.4 59.4 67.8                                 Polyol B          9.1    10.6   10.6 10.6 12.2                                 Polyol C          40     30     30   30   20                                   Water Added       0.32   0.32   0.16 0.24 0.32                                 Iaocynate A       125    122    122  123  124                                  Foam Properties                                                                Foam density, pcf 18.90  20.26  33.02                                                                               15.66                                                                               18.59                                % Deflection @ Yield, comp.                                                                      8.4    8.6    7.4  4.1  7.45                                 Compressive Yield Pt, psi                                                                        1096   970    2734 651  880                                  Compressive Str, 10% defl., psi                                                                  1084   960    3054 747  816                                  Compressive Str, 15% defl., psi                                                                  1040   936    3111 789  824                                  Compressive Str, 20% defl., psi                                                                  1060   960    3064 818  856                                  Ratio 20%/10%     0.98   1.00   1.00 1.09 1.05                                 ______________________________________                                    

Table II illustrates the strain/stress relationship employing the polyol of the invention.

                                      TABLE III                                    __________________________________________________________________________                    Example                                                                        15 16 17 18 19 20 21 22 23 24                                   __________________________________________________________________________     Polyol A       50.9                                                                              33.9                                                                              17.0                                                                              -- 50.9                                                                              50.9                                                                              50.9                                                                              50.9                                                                              50.9                                                                              84.8                                 Polyol B       9.1                                                                               6.1                                                                               3.0                                                                               -- 9.1                                                                               9.1                                                                               9.1                                                                               9.1                                                                               9.1                                                                               15.2                                 Polyol C       40 60 80 100                                                                               40 40 40 40 40 --                                   Water          0.32                                                                              0.32                                                                              0.32                                                                              0.32                                                                              0.16                                                                              0.24                                                                              0.40                                                                              0.32                                                                              0.32                                                                              0.32                                 Isocyanate A   129                                                                               128                                                                               127                                                                               126                                                                               127                                                                               128                                                                               132                                                                               109                                                                               148                                                                               124                                  Foam Properties                                                                Foam Density, pcf                                                                             21.3                                                                              22.6                                                                              19.4                                                                              23.2                                                                              36.5                                                                              33.7                                                                              17.4                                                                              21.0                                                                              27.2                                                                              19.7                                 Yield pt., psi 1184                                                                              1034                                                                              946                                                                               1568                                                                              -- 1210                                                                              -- -- 1960                                                                              --                                   % Yield        10 9.1                                                                               9.1                                                                               10.3                                                                              -- 13.5                                                                              -- -- 9.8                                                                               --                                   10% Compressive Strength, psi                                                                 1184                                                                              1032                                                                              940                                                                               1556                                                                              1290                                                                              1162                                                                              580                                                                               1058                                                                              1956                                                                              740                                  15% Compressive Strength, psi                                                                 1160                                                                              960                                                                               870                                                                               1380                                                                              1368                                                                              1204                                                                              564                                                                               1058                                                                              1740                                                                              760                                  20% Compressive Strength, psi                                                                 1160                                                                              964                                                                               856                                                                               1280                                                                              1394                                                                              1186                                                                              580                                                                               1084                                                                              1764                                                                              790                                  Ratio 20%/10%  0.98                                                                              0.93                                                                              0.91                                                                              0.82                                                                              1.08                                                                              1.02                                                                              1.00                                                                              1.02                                                                              0.90                                                                              1.07                                 __________________________________________________________________________

                  TABLE IV                                                         ______________________________________                                         Example      25       26       27     28                                       ______________________________________                                         Formulation, pbw                                                               Polyol A     50.9     33.9     50.9   59.4                                     Polyol B     9.1      6.1      9.1    10.6                                     Polyol C     40       60       40     --                                       Polyol F     --       --       --     30                                       Water        0.32     0.32     0.16   0.32                                     Foam Properties                                                                Density, pcf 20.9     20.7     32.5   31.1                                     Yield Str. psi                                                                              836      939      2244   --                                       Compression Strength                                                           10% deflection, psi                                                                         1014     1138     2646   2048                                     20% deflection, psi                                                                         964      1138     2496   2191                                     Ratio 20%/10%                                                                               0.95     1.00     0.94   1.07                                     ______________________________________                                          Curves A-D of FIG. 1 represent the foams of Examples 28, 27, 25, and 26,       respectively.                                                             

The embodiments of the invention in which an exclusive privilege or property is claimed are defined as follows:
 1. A method of shoring a geological formation which comprises preparing a rigid polyurethane foam which exhibits nearly constant strain with increasing stress in compression wherein the rigid foam is the reaction product of a mixture of polyether polyols, an organic polyisocyanate, a catalyst and a silicone surfactant wherein said polyol mixture comprises an effective amount of an oxyalkylated toluenediamine polyol having a structure of ##STR5## wherein w, x, y, and z represent numerals from 0 to 2; a, b, c, and d represent numerals from 1 to 5; w+x+y+z is from 2 to 5; a+b+c+d is from 2 to 5 and wherein w+x+y+z+a+b+c+d is not less than 5 nor more than 9, and a polyether polyol having a functionality from 2 to 8 and a molecular weight range from 200 to 1000 and placing said rigid foam over a support and interposing said support between the areas to be shored.
 2. The method of claim 1 wherein the polyol mixture contains from 30 to 60 parts of oxyalkylated toluenediamine polyol per 100 parts of polyol mixture.
 3. The method of claim 1 wherein the sum of w+x+y+z is about 4 and the sum of a+b+c+d is about
 5. 4. A method of equalizing strain with increasing stress in compression by forming a layer of a polyurethane rigid foam which exhibits nearly constant strain with increasing stress in compression wherein the rigid foam is the reaction product of a mixture of polyether polyols, an organic polyisocyanate, a catalyst and a silicone surfactant wherein said polyol mixture comprises an effective amount of a polyol having a structure of ##STR6## wherein w, x, y, and z represent numerals from 0 to 2; a, b, c, and d represent numerals from 1 to 5; w+x+y+z is from 2 to 5; a+b+c+d is from 2 to 5 and wherein w+x+y+z+a+b+c+d is not less than 5 nor more than 9 and a polyether polyol having a functionality from 2 to 8 and a molecular weight range from 200 to 1000 and placing said layer between the imposing force and the resisting force.
 5. The method of claim 4 wherein the polyol mixture contains from 30 to 60 parts of oxyalkylated toluenediamine polyol per 100 parts of polyol mixture.
 6. The method of claim 4 wherein the sum of w+x+y+z is about 4 and the sum of a+b+c+d is about
 5. 